T^NTOTD CESTODES OF NORTH AMERICAN BIRDS. 37 



body increased in size poslerioiiy, with the first segments caminmiform, fol 

 lowing segments campaniform trapezoidal imbricate ; genital pores marginal. 

 Length, 13 mm. 

 Habitaculum : Meleagris gallopavo, intestine, October, Padua (Polonio)." 



In a second paper Polonio (1860a, p. 221) gave a figure of the 

 species. 



Blancliard (1891t, pp. 439-440) looked upon this form as a pos 

 sible member of the genus Davainea, and from Polonio's figure 

 deduced the following characters: 



Suckers large and round; the head seems to be surmounted by a 

 very short rostellum, probably retractile. The neck is quite long, 

 distinctly separated from the head. Segments number about 60. The 

 genital pores are unilateral; cirrus pouch is visible in the twenty- 

 sixth to the forty-fifth segment; the forty-sixth to sixtieth segments 

 are filled with eggs, which, so far as may be judged from the figure, 

 are scattered and isolated as in Davainea yroglottina. 



Stiles (1896f, p. 57) considers that Polonio's description and figure 

 are insufficient to allow the recognition of the species, and would 

 therefore ignore the species entirely. 



In 1898 Magalhaes (1898c, pp. 445-449, figs. 1-6) described as a 

 new species Davainea oligophora^ a tapeworm found in chickens in 

 Brazil. His description may be summarized as follows: 



Length, 1.73 to 3.2 mm.; width, 170 to 390/x. Head relatively 

 large, 85 to 108/x, long by 51 to 108/>i wide, with a small rostellum 

 armed at its base with a crown of numerous small hooks, which are 

 very instable and usually absent. The form of these hooks is that 

 of a hammer with recurved beak. The suckers are almost circular, 

 slightly elliptical, measuring 61 to 72;u, in longitudinal diameter by 

 43 to 54/x in transverse diameter. They are armed with three to four 

 circular rows of little hooks, which are very instable. The neck is 

 short, at times even lacking, and measures 16 to 18ju. long by 51 to 

 90/x wide. The segments number from 45 to 75, much wider than 

 long, with posterior borders somewhat longer than the anterior bor- 

 ders. The length of the segments gradually increases from 20/^ in 

 the first segments to 100/x in the final segments, and the width from 

 80 to 100/x in the first segments to 300 to 390/^ in the final segments. 

 The sexual pores are unilateral, located one in the anterior portion 

 of each segment. The cirrus is very small, cylindrical, apparently 

 provided with few small spines. A seminal vesicle [misinterpreta- 

 tion of the seminal receptacle] is very apparent in the posterior half 



« T. cantaniana Polonio. Caput globosum, centro umbonatum ; acetabulis 

 cruciatim oppositis ob majorem capitis circulum ; collum nullum ; corpus I'etror- 

 sum dilatatum, articulis supremis campanfeformibus, sequentibus campanse- 

 formibus imbricatis trapezoidalibus ; aperturse genitales marginales. Long. 0.013. 



Habitaculum: Meleagris gallopavo, in iutestina, Octobri, Patavi (Polonio). 



